It’s because it was also his dad

Butterscotch dedicated decades to his novel, while also neglecting and abusing his family, which played part in shaping Bojack into who he is

Creating art is one of the best way to give your life any meaning, as it can inspire and influence others even after you pass on.

But in the end, novel ended up being bad and forgotten. So it was all for nothing

Get Dat Fetus, Kill Dat Fetus